From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0F6CB3EFD03 for ; Fri, 8 May 2026 14:24:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250257; cv=none; b=EX2aOyJV5Dzf1hB/u+bm9GQ0I340LvWJY8NGvTfxOwS9abZIZB+KmB565pRLjeOyHCdvN/wDI1Ino4ZdSo8GUkndDLemE6GeyVRbzS8OdrPugn+BOkgKT27xjK9MgKGhdioevF+TOr875m0aK8In8iDIqKsxtuQ3YNGtC0TqzlY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250257; c=relaxed/simple; bh=oPhzd0tvgEBGycqf2rvgrKyZkYSD0YtdFtLWCqkpCus=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=nSPFZjPgHF+PGC5aBOQJ/2/zi2717X8Q9mdOcdMTuAGa/KI2BZi+GgBhICTntEmsk+ZwldeYXrUszt9dfmsQBoE9NqdSapPYcy0yNbOT0F9CVyCz9zhctfNQUhFL00gLN+sjPEWGe95P8CYv3rhLI8oNaEz6nQ7zBbVEo4+2FaU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pY07Hj5I; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="pY07Hj5I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 957BAC2BCB0; Fri, 8 May 2026 14:24:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250257; bh=oPhzd0tvgEBGycqf2rvgrKyZkYSD0YtdFtLWCqkpCus=; h=From:To:Cc:Subject:Date:Reply-To:From; b=pY07Hj5IQtrlci36eqV0g7VGkRgPAm0kFg9YyYdviwSxjL+xos28MMtXkQ9S6oXpY 3q8NZXnjDhJ3+BVUfsNIu6oQoZZpFZbPwlY29lvkFKNACRFUNfpQ5eiUcXoASa1XXS cV2fGJMF0ekCL8lvNcJOPS0PXhP4+C2M1wRnw74M= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43405: libceph: Use u32 for non-negative values in ceph_monmap_decode() Date: Fri, 8 May 2026 16:22:14 +0200 Message-ID: <2026050841-CVE-2026-43405-38d6@gregkh> X-Mailer: git-send-email 2.54.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3285; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=fpjZJlkmdZ4Tfh+v9bST0ahLWrMmikguj6zPg56ZTCE=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/P5beL6nJP3H7aZZd/oy17b+F9h3fOd10ZktN9ZQDE y/JunTzd8SyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEbJcxzGbfxa1VcvZBxCHD 9W52M+M4TD96RDPMFfWUXG1axmFzOr7T19gztLu93iYAAA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL. The Linux kernel CVE team has assigned CVE-2026-43405 to this issue. Affected and fixed versions =========================== Fixed in 5.15.203 with commit ee5588e2bc41acb73f6676c0520420c107cd0140 Fixed in 6.1.167 with commit 86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 Fixed in 6.6.130 with commit 5f2806684b05bd24d05c091083b8e2517ba8ffac Fixed in 6.12.78 with commit b268984ae88cb0dcd7a8e8263962c748448e26e8 Fixed in 6.18.19 with commit ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace Fixed in 6.19.9 with commit 08bc6173fd611ad5a40f472bf5f15b92aea0fe40 Fixed in 7.0 with commit 770444611f047dbfd4517ec0bc1b179d40c2f346 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-43405 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/ceph/mon_client.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140 https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8 https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40 https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346